CHAPTER 10: DMAC
502 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
6. Usage Precautions
This section explains the precautions on using DMAC.
Precautions on Register Setting
When setting DMAC register, please note the following matters.
− The DMACR, DMACA, DMACB, DMACSA and DMACDA registers can be accessed by byte,
half-word and word.
− The register address in DMAC cannot be set to the DMACSA or DMACDA register.
− Channel setting registers cannot be changed during DMA transfer, except the DE/DH bits of
DMACR, the EB/PB bits of DMACA and the EM bit of DMACB.
Precautions on Stop and Timer Mode Transition
When transiting to Stop mode and Timer mode, make sure to stop the operation of all channels of the
DMAC and confirm the stop of the DMAC by DS flag. If the transition is made to Stop mode and Timer
mode while DMAC is operating, an unexpected operation can be executed when returning to Run mode.
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